Current Transformers

Current transformers or (CT’s) are instruments that are used to transform the current from a high current into a lower current so that the power can then be used for measuring and controlling. The transformers consist of a core, a primary and a secondary winding.RS Components offer an extensive range of highly accurate CT’s in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

How does a current transformer work?

When an alternating current flows through the primary winding, a magnetic flux is created which then induces an alternating current in the secondary winding. This alternating current is proportional to the current in its primary. Current transformers are also known as a "step-down transformers". Once the current has been reduced it can be safely monitored and measured using an ammeter.

Types of current transformer

Toroidal Current Transformer - These transformers are shaped like a doughnut they do not contain a primary winding. Instead, the line that carries the current flowing in the network is threaded through a window or hole in the toroidal transformer. Toroidal transformers offer high efficiency with minimal excess noise and little excess leakage inductance.Wound Current Transformer The transformers primary winding is physically connected in series with the conductor that carries the measured current flowing in the circuit. The magnitude of the secondary current is dependent on the turns ratio of the transformer.Bar-type Current Transformer – This type of current transformer uses the actual cable or bus-bar of the main circuit as the primary winding, which is equivalent to a single turn. They are fully insulated from the high operating voltage of the system and are usually bolted to the current-carrying device.

Where would I use a current transformer?

CT's are used in a wide range of industrial and commercial measurement applications. Some of the most common are:Generating stationsElectrical substationsCommercial electric power distributionElectrical panels


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Description Price Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS Stock No. 321-6315
Mfr. Part No.LTS 15NP
BrandLEM
SGD27.93
Each
units
48:1 3.2mm - Closed Loop 5 V 48A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 173-0215
BrandRS PRO
SGD3.292
Each (In a Box of 351)
units
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 667-3437
Mfr. Part No.CSDA1DA
BrandHoneywell
SGD41.45
Each
units
1:1 10.9mm - Open Loop 6 → 16 V dc 1A 20 mA 19mm -25°C 31.8mm +85°C 25.4mm - -
RS Stock No. 124-3880
BrandRS PRO
SGD2.26
Each
units
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 793-4597
Mfr. Part No.HO 8-NP
BrandLEM
SGD13.81
Each
units
25:1 - - Open Loop 4.5 → 5.5 V 25A 8 A 12mm -40°C 12mm +105°C 23.94mm - -
RS Stock No. 801-6296
Mfr. Part No.2810625
SGD420.64
Each
units
5:1 - - - 19.2 → 253 V ac/dc 5A 0 → 20 mA 104mm -20°C 22.5mm +65°C 114.5mm - -
RS Stock No. 499-5356
Mfr. Part No.LTSR 6-NP
BrandLEM
SGD28.68
Each
units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 497-198
Mfr. Part No.HASS 100-S
BrandLEM
SGD32.63
Each
units
300:1 20.4 x 10.4mm - Open Loop 5 V 300A - 30mm -40°C 40mm +85°C 30mm - -
RS Stock No. 497-243
Mfr. Part No.AT 150 B10
BrandLEM
SGD120.93
Each
units
150:1 16mm - - - 150A - 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 331-480
Mfr. Part No.CTSCM40600/5-5/1
BrandHOBUT
SGD61.13
Each
units
600:5 - Clip Fit - - 600A 5 A 104.5mm -30°C 116mm +80°C 35.5mm - -
RS Stock No. 715-7970
Mfr. Part No.2308027
SGD420.04
Each
units
100:1 32mm - - 20 → 30 V dc 100A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
RS Stock No. 451-1380
Mfr. Part No.LF 505S
BrandLEM
SGD201.77
Each
units
800:1 30.2mm - Closed Loop 15 → 24 V 800A 100 mArms 70.3mm -40°C 80mm +70°C 40mm - -
RS Stock No. 161-4595
Mfr. Part No.CMS2005-SP3
BrandSensitec
SGD31.436
Each (In a Tray of 50)
units
5:1 - - - ±15 V 5A - 23mm -25°C 35mm +85°C 7.3mm - -
RS Stock No. 782-6809
Mfr. Part No.8-1611461-1
SGD36.77
Each
units
- - - - - - - - - - - - 6.67 x 5.54 x 6.65 mm -
RS Stock No. 446-0563
Mfr. Part No.AKR 5 B420L
BrandLEM
SGD457.21
Each
units
5:1 21.7mm - - 24 V dc, 150 V ac 5A 4 → 20 mA 57.2mm -20°C 89.7mm +50°C 30mm - -
RS Stock No. 499-5362
Mfr. Part No.LTSR 15-NP
BrandLEM
SGD32.13
Each
units
48:1 3.2mm - Closed Loop 5 V 48A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 351-106
Mfr. Part No.MI20
SGD93.74
Each
units
20:1 - - - - 20A - 45mm -20°C 52mm +60°C 16mm - -
RS Stock No. 294-9266
Mfr. Part No.CTRA8120/5-2.5/1-1809
BrandHOBUT
SGD29.71
Each
units
- - - - - - - - -30°C - +85°C 70mm - 5A Moving Iron Meters
RS Stock No. 497-110
Mfr. Part No.LA 200-P
BrandLEM
SGD112.83
Each
units
300:1 13 x 11mm - Closed Loop 12 → 15 V 300A 100 mArms 33.6mm -40°C 48.4mm +85°C 21.4mm - -
RS Stock No. 499-5609
Mfr. Part No.APR 100 B10
BrandLEM
SGD211.81
Each
units
100:1 18mm - Closed Loop 24 V dc 100A - 69mm -20°C 67mm +60°C 55mm - -